Core-shell-structured CNT@RuO2 composite as a high-performance cathode catalyst for rechargeable Li-O2 batteries

Zelang Jian, Pan Liu, Fujun Li, Ping He, Xianwei Guo, Mingwei Chen, Haoshen Zhou

    Research output: Contribution to journalArticlepeer-review

    393 Citations (Scopus)

    Abstract

    A RuO2 shell was uniformly coated on the surface of core CNTs by a simple sol-gel method, and the resulting composite was used as a catalyst in a rechargeable Li-O2 battery. This core-shell structure can effectively prevent direct contact between the CNT and the discharge product Li2O2, thus avoiding or reducing the formation of Li 2CO3, which can induce large polarization and lead to charge failure. The battery showed a high round-trip efficiency (ca. 79 %), with discharge and charge overpotentials of 0.21 and 0.51V, respectively, at a current of 100mA gtotal-1. The battery also exhibited excellent rate and cycling performance. Get your battery going: Core-shell-structured CNT@RuO2, a good catalyst for oxygen-reduction and oxygen-evolution reactions, was used to construct a Li-O2 battery with a low overpotential (0.72V) and thus a high round-trip efficiency (ca. 79 %). By preventing the direct contact of Li2O2 with the carbon nanotube (CNT), the uniform RuO2 coating hinders the formation of Li2CO3 to improve round-trip efficiency and cycling performance (see picture).

    Original languageEnglish
    Pages (from-to)442-446
    Number of pages5
    JournalAngewandte Chemie - International Edition
    Volume53
    Issue number2
    DOIs
    Publication statusPublished - 2014 Jan 7

    Keywords

    • bifunctional catalysts
    • carbon nanotubes
    • core-shell structures
    • lithium-air batteries
    • ruthenium

    ASJC Scopus subject areas

    • Catalysis
    • Chemistry(all)

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